Rotary jet-pump.



G. HOLZAPFEL.

ROTARY JET PUMP.

APPLIOATION FILED DB0. 29, 1910.

1,085,045. Patented .1811.20, 1914.

3 SHEETS-SHEET 1.

G. HOLZAPFBL.

ROTARY JET PUMP.

APPLICATION FILED DEO. 29, 1910.

1085,045. Patented Jan. 2o, 1914.

3 SHEETS-SHEET 2.

I'znesses: @All m` Jiu/enfer.

G. HOLZAPFEL.

ROTARY JET PUMP.

APPLICATION FILED DBO. 29,' 1910.

1,085,045. Patented Jan.. 20, 1914.

3 SHEETS-SHEET 8.

Mmesses are PA ENT GFI@ Romer JET-PUMP.

Specification of Letters Patent.

Patented J an. 2d, 1914.

Application filed December 29, 1910. Serial No. 592,948.

To all 'whom t may concern:

Be it known that I, GEORG IIoLzAPFnL, a subject of the King of Prussia, residing at Kanonenstrasse 5, ,Essen-on-the-Ruhr, Germany, have invented new and useful Improvements in Rotary J et-Pumps, of which the following is a specification.

The present invention relates to an apparatus in which rotatingturbine wheels are employed in the rarefaction and compression of gases and vapors.

To let a liquid pass from a rotating turbine wheel, so that the particles of the liquid are hurled through a drawing-olf chamber tilled with air or gas and at such a high velocity that the liquid is able, by virtue of its energy of flow, to carry away the medium to be conveyed to a place with a higher pressure, is well known. Then methods based upon this fundamental principle are employed, the turbine wheel is provided with an annular nozzle with a narrow outlet slitV on its periphery.

The present invention primarily resides therein that the breadth ofthe slit is made adjustable, by moving one non-rotating wall of the nozzle relatively to the opposite wall, which rotates with the turbine wheel.

The invention consists in the production of interdependence between the breadth of the respective slits of a pair of wheels, which enables the wheels to set themselves automatically to the same delivery when the breadth of the slit of one wheel has been adjusted.

The invention will be now' described with reference t0 the accompanying drawings, whcrein- Figure l shows in section one example of construction of the invention; Fig. 2 a section in larger scale of a part of Fig. l. Fig. 3 'a view similar to Fig. l but showing another constructional example, Fig. 4 a section in larger scale of a part of Fig. 3. Figs. 5 and 6 are longitudinal sections of two further constructional examples of the invention.

Upon a shaft a, Figs. l and 2, two turbine wheels o and c are rigidly mounted relatively to each other; their function being to draw a liquid, such as water, from the two pipes (l and hurl it from the annular nozzle e arranged at their periphery, through a steam air chamber f toward the opposite stationary nozzle chamber g, from which the mixture runs away through the pipe h. An annular nozzle e is formed in each of the turbine wheels by the rings z' land le (see Fig. 2) of which the inner one vl rotates with the wheel, while the outside ring is non-rotative. The water pressure, produced in each nozzle e by the rotation of the turbine wheels, tends to center the turbine wheels, together with the nozzle rings 1I, between the stationary rings lc.

If now by any chance the shaft with the turbine wheels be moved axially, toward the right forexample, that is to say should the outlet width of an annular nozzle become greater, say at the left hand nozzle e and less at the right hand one, more water will pass out on Athe left than on the right and the fluid pressure will consequently fall on the left and rise on the right. Since the pressure preponderates on the right hand side, the shaft and theturbine wheels will therefore be again thrust axially. toward the left, until the pressures in the two nozzles bala-nce each other; that is to say until the breadths of slits and the deliveries are the same on both right and left.. When therefore any ,dii'erence in width in the two slits occurs, a force will always arise which corrects this inequality. This automatic regulation also comes into operation, when the outlet slit of the left hand wheel is altered from theoutside by turning the hand wheel Z. In this case the adjustment will always distribute itself uniformly over both wheels, so that by the movement of one nozzle wall the wdthof both nozzles and consequently the delivery of both turbine wheels will be simultaneously regulated. The same regulation is also present, if the movable rings 'i be arranged on the outside and the stationary ones 7c on the inside. In like manner several pairs of wheels may be arranged instead of two wheels. For the purpose of attaining a higher eil'ect the stationary nozzle rings lc may be provided with guide blades k2, see Fig. 2 as in high pressure turbine pumps.

For the purpose of increasing the certainty of action of the above described jet pumps, the parts may in some cases be so arranged, that the .rotating nozzle wall 2 is constructed as an independent-body, to rotate and tomove sidewise, and a pump .constructed in' this manner is illustrated in Figs. 3, and 4. This construction prevents vibravia tions in an axial direction, liable to arise at high speed from being transmitted to the slit of the nozzle.

The machine consists substantially of the two turbine wheels or impellers b c, which are rigidly secured on the shaft relatively to each other and it also comprises the nozzle walls 2 L. The outer nozzle wall does not rotate, but it can be adjusted in a lateral direction; the two other nozzle walls 2 are rigidly connected to each other by the running or bearing box m, which box 'm is revolubly mounted and is movable axially upon the hub connecting the turbine wheels Z) c. T he freely mounted nezzle walls 2 are enabled by this arrangement to automatically correct the difference in width in the slits of the nozzles independently of the shaft, by the movement of the two 'inner nozzle walls 2 in an axial direction, and to assume a speed of rotation which lies below the speed of revolution of the turbine wheels so that the friction between the walls of the nozzles and the particles of fluid is reduced. -When very thin jets are desired, the axial displacement of the nozzle walls i2 need only be very small.' The ability of the nozzle walls 2 to rotate freely upon the shaft also brings about a further important advantage. impurities, such as sand or the like, carried along with the water, deposit themselves into the narrow outletl slit between the nozzle walls 2 la, and if therefore the movable walls 2 were coupled with they shaft, these foreign bodies,"would cause corrosion and damage to both walls of the nozzle, whereby the eiliciency of the pump would be seriously affected. lf'on the other hand the nozzle walls 2 can rotate freely on the shaft, they will simply remain stationary in case any impurities are deposited and are therefore not subjected to damage. The same thing will happen, should foreign bodies of large dimensions, such as broken o rivet heads or the like, get into the pump. Since impurities of the kind herein before mentioned can scarcely be entirely. kept4 away from the pump, the ability of the nozzle walls to rotate freely relatively to the shaft is extremely important for pumps of this kind, whether the nozzle walls were also movable axially upon the shaft or not.

In some cases it 4might be preferable to construct the rotating nozzle walls p, r, see Figs. 5 and 6, in such a manner, that they are capable of oscillating or pendulum movement relative to their longitudinal axis. lhe purpose of this arrangement is to prevent the thickness of the jet from vary. ing at diierent points of the periphery of the nozzles, which might have been caused by inaccurate construction or assembling.

ln F ig. 5, the sleeve o connecting the nozzle 'walls p and r and running on the cylindrical sleeve of the turbine wheels surrounding thejshaft s has the shape of a paraboloid; while in Fig. 6 the sleeve t connecting the turbine wheels of the pump is provided with a spherical seat at, which bears the sleeve 0 having a ball-shaped cavity fw of greater radius than the seat u. Unless suflicient play has been provided between the bearings u and w the automatic adjustment of the width of the nozzles will take place as in Figs. l and 2, that is, by axial displacement of the turbine wheels and their shaft.

l. ln a rotary jet pump, the combination with the impeller, of an annular nozzle having relatively movable walls, one of which is movable and admits of movement with the impeller.

2. In a rotary jet pump, an annular nozzle, lone wall of which is revoluble and admits of rotation with the impeller while the other wall is non-rotatable, but movable axially relative to the rotatable wall.

3. In a rotary jet pump, the combination with a turbine impeller of an annular nozzle comprising two non-rotatable.wallsl and two rotatable walls and means rigidly connecting the rotatable walls, so that when the delivery of one impeller is regulated vthe other is simultaneously regulated, whereby both have an equal delivery.

4. In a rotary jet pump an annular nozzle having non-revoluble walls, and rigidly connected revoluble walls, and means whereby said revoluble walls may move pendulum like relative to their longitudinal axis.

l 5. In a rotary jet pump, the combination with. an impeller of an annular nozzle comprising a revoluble wall and a non-rotal table wall said walls` surrounding the impeller, guide blades attached to the non-rotatable wall.

6. In a rotary jet pump, the combination with an impeller of an annular nozzle, one wall of which is revoluble, while the other wall is adjustable said walls surrounding said impeller, and guide blades attached to said adjustable wall.

7. In a rotary jet pump, the combination with a turbine impeller of an annular nozzle, one wall of which is stationary, while the other wall is revoluble and admits of r0- tation together with said turbine impeller.

8. ln a rotary jet pump, the combination with a turbine impeller of an'annular nozzle, one wall of which is adjustable, while the'other wall is revoluble and admits of rotation together with said turbine impeller.

9. In a rotary jet pump, the combination with a turbine impeller of an annular nozzle, one wall of which is non-rotatable, while the other wall is revoluble relatively to said turbine impeller and to the non-rotatable wall.

10. lin a rotary jet pump, the combination relatively to each other, of an annular nozzle comprising two non-rotatable walls and two revoluble walls, said revoluble walls being rigidly connected to each other and axially movable relatively to said turbine y .impellers ll. In a rota-ry jet pump, the combination with two turbine impellers of an annular nozzle comprising two non-rotatable walls and two rotatable walls, said rotatable walls being rigidly connected to each other and revoluble relatively both to said turbine impellers and to the non-rotatable walls.

12. In a rotary jet pump, the combination with two turbine impellers of anV annular nozzle comprising two non-rotatable walls and two rotatable walls, said rotatable Walls being rigidly connected to each other and being both axially movable and revoluble 4 relatively to said turbine impellers.

13. In a rotary jet pump, the combination with two turbine impellers of an annular nozzle comprising two non-rotatable' walls and two rotatable walls and means rigidly connecting the rotatable Walls, so that both impellers will have an equal delivery.

14. In a rotary -jet pump, the combination with t'w'o turbine impellers of an annular nozzle comprising two non-rotatable walls, one of which is adjustable, and two rotatable walls and means rigidly connecting the rotatable walls, so that when the delivery of one impeller is regulated, the other is simultaneously regulated, whereby both have an equal delivery.`

Dated this 16th day of December 1910.

GEGRG HOLZAIFEL.v [La] l Witnesses:

CHAS. J. WRIGHT, ALFRED HINKEL. 

